JPH04248799A - Speaker equipment - Google Patents

Abstract

PURPOSE:To make the speaker equipment small in size and to improve the balance inexpensively in terms of sound quality by arranging a passive radiator coaxially the outside of a diaphragm reproducing a low frequency sound. CONSTITUTION:A passive radiator 24 is arranged coaxially at the outside of a diaphragm 18 of a speaker unit 3. Thus, it is not required to increase the size of an enclosure in the horizontal direction or the vertical direction to accommodate the passive radiator 24 without arranging the radiator 24 at a position parted in the horizontal and vertical direction. Moreover, a sound pressure from the diaphragm 18 of the speaker unit 3 being a sound source is reflected in a rear wall of the enclosure 2 located at the rear side and reaches each position of the passive radiator 24 almost simultaneously, then the passive radiator 24 is vibrated almost uniformly and the balance with the diaphragm 18 is improved.

Description

[Detailed description of the invention]

0001

FIELD OF INDUSTRIAL APPLICATION The present invention relates to a speaker device equipped with a novel passive radiator. Specifically, by devising the shape and location of the passive radiator, it has been made smaller, less expensive, and has better balance in sound quality.

0002

2. Description of the Related Art Various efforts have been made to improve the bass characteristics of speaker devices.

One such device is a passive radiator type speaker device (drone cone type speaker device) in which a diaphragm without a drive system (hereinafter referred to as a “passive radiator”) is arranged in the same enclosure separately from the speaker unit. ).

FIGS. 6 and 7 show an example of a conventional speaker device equipped with a passive radiator.

[0005] A is a rectangular parallelepiped enclosure, and a full-range speaker unit b is mounted on the upper part of the front panel.
is installed, and a passive radiator c is installed below it.
is installed.

The passive radiator c is formed to have substantially the same shape and size as the diaphragm of the speaker unit b.

[0007] When the diaphragm of the speaker unit b vibrates, the passive radiator c is generated inside the enclosure a instead of the duct air mass in the so-called bass reflex operation.
will resonate and emphasize the bass.

[0008]

However, in the above-mentioned conventional speaker device equipped with a passive radiator, the passive radiator c, which has approximately the same shape as the diaphragm of the speaker unit b, is located at a distance from the speaker unit b. This necessitates a relatively large horizontally or vertically long enclosure a, which poses a problem in that the speaker system must be large.

[0009] Furthermore, since the passive radiator c is disposed at a position spaced apart from the speaker unit b in the horizontal or vertical direction, there is a gap between the resonance vibration of the passive radiator c and the vibration of the diaphragm of the speaker unit b. There was a problem in that the sound quality was easily deteriorated due to poor balance, and it was extremely difficult to design a way to reduce this.

That is, when the diaphragm of the speaker unit b, which is the sound source, vibrates, most of the sound pressure is reflected by the back wall of the enclosure a and reaches the passive radiator c. , the arrival time of the sound pressure to each part of the passive radiator c is different. In such a case, the vibrations of the passive radiator c will not be centered around the center of the passive radiator c, resulting in non-uniform vibrations and deterioration of sound quality.

[0011]

[Means for Solving the Problems] Accordingly, in the speaker device of the present invention, a passive radiator is disposed coaxially with a diaphragm outside a diaphragm for reproducing bass sounds.

0012

[Operation] Therefore, according to the speaker device of the present invention, since the passive radiator is disposed on the outside of the diaphragm of the speaker unit and coaxially therewith, the passive radiator is disposed at a position spaced apart from each other in the horizontal or vertical direction. There is no need to increase the size of the enclosure that houses these in the horizontal or vertical direction, and the size can be reduced.

[0013] Furthermore, the sound pressure from the diaphragm of the speaker unit, which is the sound source, is reflected from the back wall of the enclosure located behind it and reaches each part of the passive radiator almost simultaneously. It can vibrate evenly, has a good balance with the diaphragm of the speaker unit, and provides good sound quality.
This makes it possible to easily design the speaker unit.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the speaker device of the present invention will be explained below according to the illustrated embodiments.

Each of the embodiments is applied to a so-called coaxial type two-way one speaker unit in which a high-pitched speaker unit is coaxially provided in the center of one medium-low frequency speaker unit.

Reference numeral 1 denotes a speaker device, which includes a box-shaped enclosure 2 having a substantially square front shape, a speaker unit 3 supported by the enclosure 2, and a speaker unit 3 surrounding the outer periphery of the speaker unit 3 when viewed from the front. It consists of a passive radiator section 4 and the like arranged coaxially with the speaker unit 3.

The enclosure 2 consists of a cabinet body 5 having an open front and a baffle 6 covering the front opening of the cabinet body 5.

The back wall of the cabinet body 5 is formed with an inwardly recessed portion 5a at approximately the center thereof, and the baffle 6 is formed with a wide speaker mounting hole 6a. 5 by screws or other means.

The speaker unit 3 has a substantially truncated conical frame 7 whose diameter increases toward the front and is open toward the front, a vibrating section 8 disposed within the frame 7, and a vibrating section 8 disposed at the rear of the frame 7. The drive unit 9 includes a drive unit 9 for driving the vibrating unit 8 and the like.

Reference numeral 10 denotes a flange portion projecting outward from the front opening edge of the frame 7, and supports the front end of the vibrating section 8 and the rear end of the passive radiator section 4, as will be described later. .

Reference numerals 11, 11, . . . are notch holes formed in the side wall of the frame 7, and are formed into a substantially trapezoidal shape when viewed from the side.

Reference numeral 12 denotes a stepped portion formed near the rear end of the side wall of the frame 7, concave inward and directed forward and inward.

Reference numeral 13 denotes an inward flange portion that protrudes inward from the rear end opening edge of the frame 7. The inward flange portion 13 is screwed to the drive portion 9 and the frame 7
and the drive section 9 are coupled.

The drive unit 9 includes a yoke 14 made of a magnetic material, a magnet 15 attached to the front surface of the yoke 14, a plate 16 made of a magnetic material attached to the front surface of the magnet 15, and the yoke 14 and the magnet 15. and a voice coil, which will be described later, located in a closed magnetic path formed by the plate 16.

The yoke 14 includes a disk-shaped disk portion 14a and a cylindrical center pole portion 14b integrally projecting forward from the center of the front surface thereof.

The magnet 15 is ring-shaped, and its inner diameter is approximately half the diameter of the disk portion 14a of the yoke 14, and its outer diameter is slightly larger than the outer diameter of the disk portion 14a of the yoke 14. The cut surface when cut in the radial direction has a rectangular shape.

The plate 16 has a ring shape that is one size smaller than the magnet 15, and its inner diameter is larger than the outer diameter of the center pole portion 14b, and its outer diameter is approximately the same as the outer diameter of the disk portion 14a. The cut surface when cut in the radial direction is rectangular.

The yoke 14, the magnet 15, and the plate 16 are arranged coaxially, and the disk portion 14 of the yoke 14
a and the plate 16 are connected with screws or the like so that the magnet 15 is sandwiched between the plate 16 and the magnet 15.

Furthermore, at this time, a gap 17 is formed between the inner circumferential surface of the plate 16 and the outer circumferential surface of the tip of the center pole portion 14b of the yoke 14.

Thus, the magnet 15 - the disk part 14a of the yoke 14 - the center pole part 14b of the yoke 14 -
A closed magnetic path of gap 17-plate 16-magnet 15 is formed.

Such a combination of the yoke 14, the magnet 15, and the plate 16 can be constructed by screwing the disc portion 14a of the yoke 14 onto the front surface (inner surface) of the recess 5a of the cabinet body, so that it can be inserted into the cabinet body 5. will be placed in

Further, the frame 7 has its inward flange portion 13 in contact with the front surface of the plate 16, and is attached to the cabinet coaxially with the plate 16 etc. using screws for connecting the plate 16, the magnet 15, and the yoke 14. 5.

The vibrating section 8 includes a funnel-shaped diaphragm 18 and a cylindrical coil bobbin 1 attached to the rear edge of the diaphragm 18.
9 and a voice coil 20 wound around the coil bobbin 19.
Consists of etc.

The diaphragm 18 has an approximately circular band-shaped edge 21 attached to the entire circumference of the front opening edge so as to surround the opening edge, and the outer periphery of the edge 21 is attached to the flange portion of the frame 7 11 and a gasket 22 which is approximately circular band-shaped.
It is supported in a pinched manner by.

The outer diameter of the coil bobbin 19 is approximately the same as the inner diameter of the rear opening of the diaphragm 18, and the tip of the coil bobbin 19 is fixedly fitted into the rear opening of the diaphragm 18.

The inner diameter of the coil bobbin 19 is slightly larger than the outer diameter of the center pole portion 14b, and a voice coil 20 is wound around the outer peripheral surface of the rear end thereof.

23 has the above-mentioned coil bobbin 19 in its center.
The damper is approximately disk-shaped and has a central hole that is approximately the same size as the outer diameter of the damper, and is shaped like a bellows along the radial direction of the damper.

The outer peripheral edge of the damper 23 is connected to the frame 7.
The coil bobbin 19 is supported by the front-facing surface of the stepped portion 12, and its inner circumferential edge is supported by the outer circumferential surface of the coil bobbin 19 near the diaphragm 18 in an externally fitting manner.

The edge 21 and the damper 23 allow the diaphragm 18, coil bobbin 19, etc. to be connected to the frame 7.
The voice coil 20 is supported by the center pole portion 14b and the plate 16 so as to be able to vibrate freely in the front and rear directions.
is located within the gap 17 between.

The passive radiator section 4 includes a passive radiator 24 formed in a flat, substantially truncated cone shape whose diameter increases toward the front, and a passive radiator 24 that is separately attached to the front end periphery and the rear end periphery of the passive radiator 24. It consists of edges 25 and 26 that are approximately circular band-shaped.

Of the two edges 25 and 26, the front edge 25 has its outer peripheral edge supported by the opening edge of the speaker mounting hole 6a of the baffle 6, and the rear edge 26 has its inner peripheral edge supported by the opening edge of the speaker mounting hole 6a of the baffle 6. The part is the flange part 10 of the frame 7
The gasket 22 is sandwiched between the gasket 22 and the gasket 22.

The passive radiator 24 is supported by the baffle 6 and the frame 7 via the edges 25 and 26, and is coaxial with the diaphragm 18 of the speaker unit 3 and surrounds the diaphragm 18 when viewed from the front. will be placed.

The area of the passive radiator 24 is preferably formed to be approximately the same as the area of the diaphragm 18, but it varies depending on the frequency band in which the passive radiator 24 is to resonate, and can be changed in design. It is.

27 is a high-pitched speaker unit;
The rear end portion is fixed to the front end surface of the center pole portion 14b with screws or the like, and the high-pitched speaker unit 27 is disposed approximately at the center of the vibrating portion 8.

[0045]The speaker device 1 provided with such a passive radiator 24 is driven as follows.

That is, when an audio current is passed through the voice coil 20 of the speaker unit 3, since the voice coil 20 is located within the gap 17, that is, within the magnetic field, the amplitude and vibration correspond to the vibration of the audio current. It is made to vibrate according to the number.

[0047] Then, the vibration section 8 integrated with the voice coil 20 is vibrated, and the air in front of the diaphragm 18 is vibrated, so that a sound wave having a predetermined amplitude and frequency is generated.

Furthermore, the vibration of the diaphragm 18 vibrates not only the air in front of the diaphragm 18 but also the air behind it, that is, the air inside the enclosure 2. The passive radiator 24 is vibrated by resonance, and the vibration of the passive radiator 24 vibrates the air in front of it.

Since the vibration of the passive radiator 24 mainly resonates in the bass range, the speaker device 1 emphasizes the bass.

In addition, the propagation of sound pressure to the passive radiator 24 occurs when air vibrations generated by the diaphragm 18 of the speaker unit 3 are reflected forward by the back wall of the cabinet body 5 behind it, and the sound pressure propagates to the passive radiator section 4. Furthermore, since the diaphragm 18 and the passive radiator 24 are arranged coaxially, the sound pressure propagates almost uniformly to each part of the passive radiator 24, causing non-uniformity in the vibration of the passive radiator 24. Never.

FIGS. 4 and 5 show a second embodiment of the speaker device of the present invention.

This second embodiment uses the passive radiator section 4 of the speaker device 1 shown in the first embodiment.
The first advantage is that it is supported by the frame of the speaker unit.
The second embodiment is different from the first embodiment, and is common in many other points, so the explanation of this second embodiment will mainly focus on the points that are different from the first embodiment, and other parts will be explained in the second embodiment. The same reference numerals as those given to the same or similar parts in the first embodiment will be given, and the explanation will be omitted.

Reference numeral 1A denotes a speaker device, which includes a speaker unit 28 housed in an enclosure 2, similar to the speaker device 1 in the first embodiment.

The speaker unit 28 includes a frame 29, a vibrating section 8 disposed within the frame 29, a driving section 9 disposed at the rear of the frame 29 for driving the vibrating section 8, and a vibrating section 8 disposed within the frame 29. The passive radiator section 30 is arranged so as to surround the front opening of the radiator.

The frame 29 has a diameter increasing toward the front, and includes a frame body 31 having a substantially truncated conical shape and opening toward the front, and integrally protruding outward from the front opening edge of the frame body 31. The passive radiator mounting portion 32 has a substantially flange shape.

The passive radiator mounting portion 32 has an inner circumferential edge 32a and an outer circumferential edge 32b located on substantially the same plane as the opening surface of the frame body 31, and the inner circumferential edge 32a
A portion (hereinafter referred to as "intermediate portion") 32c between the outer circumferential edge portion 32b and the outer circumferential edge portion 32b is recessed so as to protrude rearward.

Further, the intermediate portion 32c is formed with notch holes 33, 33, . . . that are fan-shaped when viewed from the front.

Reference numeral 34 denotes a circular band-shaped passive radiator, the inner and outer peripheral edges of which are approximately circular band-shaped edges 35.
, 36, are supported by the inner peripheral edge 32a and the outer peripheral edge 32b of the passive radiator mounting portion 32, respectively.

[0059] The speaker unit 28 as described above is arranged in the enclosure 2 as a unit in which the passive radiator 34 is also integrated.

When the vibrating section 8 of the speaker unit 28 vibrates, the passive radiator 34 resonates and vibrates through the enclosure 2, emphasizing the bass.

[0061] Since the speaker unit 28 has the passive radiator 34 as a unit, it can be easily assembled into the enclosure 2.

[0062]

As is clear from the above description, the speaker device of the present invention is characterized in that a passive radiator is disposed coaxially with the diaphragm outside the diaphragm for reproducing bass sounds.

Therefore, according to the speaker device of the present invention,
Since the passive radiator is placed coaxially with the diaphragm of the speaker unit, there is no need to place the passive radiator in a space apart from each other horizontally or vertically, which reduces the size of the enclosure that houses them. There is no need to increase the size in the horizontal or vertical direction, and the size can be reduced.

Furthermore, the sound pressure from the diaphragm of the speaker unit, which is the sound source, is reflected from the back wall of the enclosure located behind it and reaches each part of the passive radiator almost simultaneously. It can vibrate evenly, has a good balance with the diaphragm of the speaker unit, and provides good sound quality.
This makes it possible to easily design the speaker unit.

Furthermore, the depth is small compared to the aperture, and the speaker itself can be made to appear larger, that is, have a larger aperture, making it possible to create a speaker device that visually provides a sense of bass.

In each of the above embodiments, the speaker device of the present invention is applied to a so-called dynamic coil type cone-shaped speaker device, but the speaker device of the present invention is not limited to this. The present invention can be applied to known speaker devices such as type or flat type speaker devices.

Furthermore, the speaker device of the present invention is not limited to a bass speaker device, but can also be applied to a full range speaker device.

Further, in each of the embodiments described above, the passive radiator has an annular shape when viewed from the front, but the passive radiator in the speaker device of the present invention is not limited to this. What is necessary is to provide a central hole that surrounds the diaphragm of the speaker unit.

[0069] In addition, the specific shapes and structures shown in each of the above embodiments are merely examples of implementing the speaker device of the present invention, and the technical scope of the present invention is not limited by these. shall not be construed as such.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a first embodiment of the speaker device of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG. 1;

FIG. 3 is a perspective view showing a main part with a portion cut away.

FIG. 4 shows a second embodiment of the speaker device of the present invention,
FIG. 2 is a perspective view showing a main part with a portion cut away.

FIG. 5 is a central longitudinal sectional view of the speaker unit.

FIG. 6 is a front view of a speaker device equipped with a conventional passive radiator.

7 is a cross-sectional view taken along line VII-VII in FIG. 6. FIG.

[Explanation of symbols]

1 Speaker device 18 Diaphragm 24 Passive radiator 1A speaker device 34 Passive radiator

Claims (1)

[Claims] 1. A speaker device characterized in that a passive radiator is disposed coaxially with the diaphragm outside of the diaphragm for reproducing bass sounds.